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For knife-sharpening emergencies

Multi-tool Keychain

Sharpen knives anywhere you are

Will not sharpen adamantium

We have to admit that this one stumped as at first. Who uses a knife so frequently that they need to have a knife sharpener with them at all times? Edward Scissorhands? Scary thought, you know what we're saying? But then, we put our thinking caps on and supposed that maybe this wasn't so out there.

For example, if you are a knife-thrower in the circus, you want those knives to be super sharp so that they stick into any wooden surface. And if you are a sword swallower, you definitely would want your swords to be really sharp, right? (Maybe not.) Plus, there are the old standbys for knife-wielders: chefs, park rangers, and Alaskan deep sea fishermen. You can never be too prepared, really.